I wonder if you could include all keystrokes like Ctrl-x in the screencast, maybe even a timeline of the keystrokes; I imagined it to be "running" along the screen like in Guitar hero. Nevertheless this is a great effort in distributing latent/implicit knowledge, which I think coding to be heavy on; for example, how would a terminal user know that Ctrl-R is reverse-search? (don't get me started on finding out about going back to a previous match...) I remember how I found out about Tab by accident... While being ignorant of these epistemes are not barriers, they do slow down/kills joy.